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Cannot change the permission of /etc/dfs/sharetab

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Operating Systems Solaris Cannot change the permission of /etc/dfs/sharetab
# 1  
Old 10-14-2011
Cannot change the permission of /etc/dfs/sharetab
I am using a Solaris 5.10 with patch level 10/08.

Here /etc/dfs/sharetab is listed as a file system with "df -k" as below:

Code:
 
#df -k /etc/dfs/sharetab
Filesystem kbytes used avail capacity Mounted on
sharefs 0 0 0 0% /etc/dfs/sharetab

What is "sharefs"? This is not present in my other Solaris machines.

I have logged in as root user. But I am not able to change the permission of /etc/dfs/sharetab file with chmod. It gives an error as "chmod: WARNING: can't change /etc/dfs/sharetab".

Please let me know what should be done to change the permission of this file.
Last edited by varunla; 10-14-2011 at 09:45 AM..
# 2  
Old 10-14-2011
It seems that your Solaris machine is exposing the file /etc/dfs/sharetab this file determines which directories will be NFS-shared at boot time. Each line is a share command.
Sharefs is a file system like proc file system.
In Solaris 10, there is a new filesystem called sharefs.
This User Gave Thanks to h@foorsa.biz For This Post:
varunla
# 3  
Old 10-14-2011
Quote:
What is "sharefs"? This is not present in my other Solaris machines.
It is a part of an in-memory file - just like /etc/mnttab. It is no longer a regular file.
# 4  
Old 10-14-2011
Thanks a lot for your reply. Do you mean I cannot change the permission of this in-memory file? If yes, why not?
# 5  
Old 10-14-2011
What are the current permissions and what do you want to change them to? And why?
This User Gave Thanks to fpmurphy For This Post:
varunla
# 6  
Old 10-15-2011
Permissions of this file can't be changed as the sharefs pseudo file system is read-only by design.

If you want to (indirectly) modify the content of this file, simply use one of the share, sharemgr, sharectl or zfs commands.
This User Gave Thanks to jlliagre For This Post:
varunla
# 7  
Old 10-17-2011
The permissions on the file is 444. I want to remove read permission to group and others. I could change the permission of this file in the ealier patch levels of Solaris 10. I am facing this problem with patch level 10/08.

Could you please tell me, if this was introduced in the recent patch levels? If yes, why?
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